Using Stack vs Direct Allocation for Uniforms

[JustKitten]

I would like to know what is accepted practice for allocating uniform buffers. These uniforms are specifically going to be updated frequently.

Method #1: "Direct Allocation"

FloatBuffer directBuffer = BufferUtils.createFloatBuffer(16);

// Render Loop
while (condition) {
    myMatrix.putInto(directBuffer);
    glUniformMatrix4fv(uniformLocation, false, directBuffer);
}

Method #2: "Stack Allocation"

// Render Loop
while (condition) {
    try (MemoryStack stack = pushStack()) {
        FloatBuffer stackBuffer = stack.mallocFloat(16);
        myMatrix.putInto(stackBuffer);
        glUniformMatrix4fv(uniformLocation, false, stackBuffer);
    }
}

The potentially naïve side of me would like to believe that Method #1 would be most ideal. Because the buffer can be recycled each render call and utilized throughout the program's lifetime.